What Time Should I Go to Sleep If I Wake Up at 5:45am?

Updated April 2026 · Based on 90-minute sleep cycles + 14-minute sleep latency

📋 If you wake up at 5:45am, your ideal bedtimes are:

8:31pm — 6 cycles (9 hours) Most Sleep
10:01pm — 5 cycles (7.5 hours) Recommended
11:31pm — 4 cycles (6 hours) Minimum
1:01am — 3 cycles (4.5 hours) Avoid Regularly

Notice that the recommended bedtime is 10:01pm — not 10:00pm. That one extra minute matters. Going to bed at 10pm sharp for a 5:45am wake-up means your alarm goes off 16 minutes into a new sleep cycle, pulling you out of deep sleep. Shifting to 10:01pm puts your wake-up right at the cycle boundary.

Full Bedtime Chart for a 5:45am Wake-Up

Bedtime	Sleep Cycles	Total Sleep	Best For
8:31pm	6 cycles	9 hours	Heavy physical work, athletes, recovery
10:01pm	5 cycles	7.5 hours	Most adults — optimal daily performance
11:31pm	4 cycles	6 hours	Minimum for healthy adults
1:01am	3 cycles	4.5 hours	Not recommended regularly

All bedtimes include a 14-minute sleep latency buffer — the time it takes most adults to fall asleep after lying down. Without this, your bedtime calculator will always be slightly off.

The 10pm Problem

If you wake up at 5:45am and go to bed at 10:00pm, you're in bed for 7 hours and 45 minutes — which sounds like a solid 7.5 hours. But once you subtract the 14 minutes it takes to fall asleep, your actual sleep starts at 10:14pm. That puts your 5:45am alarm about 19 minutes into your 5th sleep cycle — right in the middle of deep sleep. Hello, grogginess.

The fix: go to bed at 10:01pm instead of 10:00pm. Your sleep starts at 10:15pm, completing exactly 5 full 90-minute cycles by 5:45am.

Building a 5:45am Morning Routine That Works

Anchor your wake time first

Don't try to fix your bedtime first — fix your wake time. Set your alarm for 5:45am every single day for two weeks, no matter when you went to bed. Your body will naturally push you to feel sleepy earlier each night to compensate.

Avoid the "one more episode" trap

The biggest enemy of a 10:01pm bedtime is streaming. One more episode typically means 42 more minutes, pushing your bedtime to 10:43pm — landing your 5:45am alarm mid-cycle. Set a hard cutoff for screens at 9:30pm.

Caffeine curfew at 2pm

Caffeine has a half-life of around 5 hours. A coffee at 3pm still has half its caffeine active at 8pm, making it harder to fall asleep at 10pm. Move your last caffeine to 2pm or earlier.

Wake up at a different time?

Use the ZZZCalc calculator to get exact cycle-aligned bedtimes for any wake-up time.

Calculate My Bedtime →

Sleep Aids Worth Considering

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Blackout Sleep Mask

Going to bed at 8:31pm or 10:01pm while it's still light? A blackout mask is the cheapest, fastest fix.

View on Amazon →

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White Noise Machine

Evening noise is the enemy of early bedtimes. White noise is the simplest way to block it out.