What Time Should I Go to Bed? A Practical Guide

The most common sleep question, and the one with the simplest answer. Your ideal bedtime isn’t determined by what time you “should” sleep or what the productivity influencers do. It’s determined by three things: (1) when you have to wake up, (2) how many hours of sleep your age needs, and (3) the 90-minute sleep cycle.

This guide walks through how to find your bedtime, why timing matters, and what to do when it’s not working.

The simple formula

To find your ideal bedtime:

1. Start with your wake time.
2. Subtract 7.5 hours (for 5 cycles of 90 minutes) for adults, or 9 hours (for 6 cycles) if you’re younger or sleep-deprived.
3. Subtract another 15 minutes for the time it takes to fall asleep.

For a 6:30 AM wake-up:

• 5-cycle bedtime: 10:45 PM (7.5 hours of sleep)
• 6-cycle bedtime: 9:15 PM (9 hours of sleep)

For a 7:00 AM wake-up:

• 5-cycle bedtime: 11:15 PM
• 6-cycle bedtime: 9:45 PM

Our bedtime calculator does this math for any wake-up time and age band, and highlights the recommended option for your age.

How many cycles do you need?

The number of cycles you need depends primarily on your age. The National Sleep Foundation’s expert panel published recommended ranges in 2015, based on a comprehensive review of sleep research:

Age group	Recommended sleep	Cycles (at 90 min)
Teens (14–17)	8–10 hours	5–7
Young adults (18–25)	7–9 hours	5–6
Adults (26–64)	7–9 hours	5–6
Older adults (65+)	7–8 hours	5

Most adults function best on 5 cycles (7.5 hours). If you’re chronically tired, sick, or recovering from sleep debt, aim for 6 cycles (9 hours). If you naturally wake up before your alarm at 5 cycles, that’s the right amount for you.

Why cycle-aligned bedtimes matter

Here’s the science in one sentence: if your alarm catches you in the middle of deep sleep, you wake up worse than you would have at the end of a cycle.

The mechanism is sleep inertia, the foggy, slow, mentally impaired state that follows being abruptly roused from N3 deep sleep. Reaction time can drop 25%+ for 15–30 minutes after waking. Decision-making is impaired. Mood is worse. Some studies show sleep inertia can persist for an hour in extreme cases.

The solution: time your sleep to end at the natural end of a cycle, when you’re already in lighter sleep (N2 or REM). This is the entire point of the 90-minute sleep cycle math. Waking from light sleep feels gentle. Waking from deep sleep feels like being hit by a truck.

For most adults, the difference between 7.5 hours of cycle-aligned sleep and 8 hours that ends mid-deep-sleep is significant. The shorter, aligned sleep often feels better.

Why earlier bedtimes are usually better

Among healthy adults, earlier bedtimes correlate with several measurable advantages:

More deep sleep proportionally. N3 deep sleep is concentrated in the first third of the night. Going to bed at 10 PM gives you more of your night’s deep sleep window than going to bed at 1 AM, even if total hours are the same.

Better alignment with morning daylight. Bright morning light is the strongest signal for your circadian rhythm. Earlier bedtimes generally pair with earlier wake times that catch more morning light, reinforcing the rhythm.

Lower social jet lag risk. People with earlier bedtimes tend to vary less on weekends, which keeps their circadian rhythm anchored. Late bedtimes often drift later on Friday and Saturday, creating Monday-morning grogginess that’s chemically similar to actual jet lag.

Better sleep efficiency. Studies measuring time-in-bed vs. actual sleep time consistently show that earlier sleepers spend less time lying awake. Going to bed at 10 PM and falling asleep by 10:15 PM is more sleep than going to bed at midnight and falling asleep by 12:30.

There are exceptions. True night-owl chronotypes (Wolves) often perform worse on imposed early schedules because they’re fighting their biology. For them, a consistent late bedtime that lets them get full sleep is better than a forced early bedtime that doesn’t.

What “ideal” means in practice

Your ideal bedtime is the latest one that:

1. Gets you 7.5–9 hours of sleep before your alarm,
2. Lets you fall asleep within 20 minutes of getting in bed,
3. You can sustain consistently (including weekends),
4. Feels rested on a normal week.

If you’re meeting all four, you’ve found your bedtime. If you’re not, work backward:

• Can’t fall asleep within 20 minutes → bedtime might be too early (low sleep pressure) or environmental issues (light, temperature, caffeine, stress).
• Don’t feel rested → either too few cycles, fragmented sleep, or stage-affecting factors (alcohol, sleep apnea).
• Can’t sustain it on weekends → social pressure, late activities, or genuine chronotype mismatch.

Common bedtime mistakes

Going to bed too early on workdays to “store up” sleep. This usually backfires, you lie awake, frustration builds, and you sleep worse than if you’d gone to bed at your normal time. Sleep doesn’t bank that way.

Sleeping in significantly on weekends. Sleeping until 11 AM on Saturday gives you mostly REM (back of the night), but throws off your circadian rhythm so much that Sunday-night sleep is worse and Monday morning is brutal. Limit weekend sleep-ins to 1 hour past your normal wake time.

Reading or working in bed. This trains your brain to associate the bed with wakefulness, not sleep. Reserve the bed for sleep and sex only.

Going to bed at the same time as your partner regardless of when you’d actually fall asleep. If you’re a Lion and they’re a Wolf, the early bird lies awake while the night owl is on their phone next to them. Stagger your bedtimes if your chronotypes differ.

Using “I’ll catch up tomorrow” as a chronic strategy. Occasional short nights happen. Chronic late bedtimes build debt that doesn’t fully resolve on weekends.

Adjusting your bedtime

If your current bedtime is far from your ideal, shift gradually:

1. Shift in 15-minute increments. Try a 15-minute earlier bedtime for a week. Once that feels natural, shift another 15. Big jumps backfire, your circadian rhythm doesn’t move that fast.

2. Anchor your wake time first. Set a consistent wake time you can actually maintain (including weekends). The earlier wake gradually pulls your bedtime earlier.

3. Get morning light immediately. 10–15 minutes of outdoor light within an hour of waking is the strongest circadian signal. It makes the earlier bedtime feel natural within a week.

4. Dim evening light. Reduce indoor lighting after 9 PM. Use lamps instead of overheads. Most phones and laptops have night-mode settings, use them.

5. Avoid caffeine after noon. Caffeine has a 5–7 hour half-life. Afternoon coffee is still affecting your sleep onset at 11 PM.

The full shift can take 1–2 weeks. Don’t try to compress it.

When to see a doctor

A few patterns suggest more than bedtime tweaking is needed:

• You consistently take more than 30 minutes to fall asleep, multiple nights a week.
• You wake repeatedly in the night and have trouble falling back asleep.
• You snore loudly and wake unrefreshed despite long hours in bed (possible sleep apnea).
• You feel chronically exhausted despite 8+ hours in bed.
• You have racing thoughts at bedtime that prevent sleep.

For any of these, cognitive behavioral therapy for insomnia (CBT-I) is the most evidence-backed treatment for adult insomnia. It’s more effective than sleep medications long-term. A primary care doctor or sleep specialist can refer you.

The takeaway

Your bedtime is a function of your wake time minus the right number of cycles. For most adults, that’s 7.5 hours plus a 15-minute buffer to fall asleep. Use the bedtime calculator to find yours. Pick the latest option that gets you enough sleep, then protect it like you’d protect any important appointment.

Sleep timing is one of the few high-leverage variables in health that doesn’t cost anything and shows up fast in how you feel.