Find your ideal bedtime
or wake-up time.
Based on 90-minute sleep cycles, Dozofy calculates the best times to sleep so you wake up rested, between cycles, instead of in deep sleep.
Current time: — the calculation accounts for 14 minutes on average to fall asleep.
Practical tools
Free, no account needed, instant results
Bedtime calculator
Enter your wake-up time, get the best times to go to bed.
Wake time calculator
Enter your bedtime, find out when to wake up without fatigue.
Nap calculator
Micro-nap, power nap or full cycle: find the ideal duration.
Sleep debt calculator
Estimate your sleep deficit over the week and how to fix it.
Sun & moon
Sunrise, sunset and moon phase for your city, and how light exposure affects your sleep.
Chronotype quiz
Are you a morning lark or a night owl? Find your natural sleep type.
Caffeine calculator
See how much caffeine is still in your system at bedtime.
Jet lag planner
Get a day-by-day plan to adjust your sleep before and after a flight.
Sleep score quiz
A 6-question check-up on your sleep habits, with a score and tips to improve it.
Mattress finder
Answer 3 quick questions to get a personalized mattress recommendation.
Pillow finder
Find the right pillow height and material for your sleep position.
Sleep sounds
Rain, fan and white noise, generated in your browser to help you fall asleep.
Sleep diary
Log your nights for a week and see your sleep trend at a glance.
Snore risk check
A quick awareness check for signs linked to snoring and sleep apnea.
Bedroom sleep score
Score your bedroom setup and get tailored tips to sleep better.
Mattress & pillow age calculator
Find out if your mattress or pillow is due for a replacement.
Baby & child sleep calculator
Recommended sleep hours and nap windows by age, from newborn to 12.
Melatonin timing
When to take melatonin relative to your bedtime, and what the research says about dosing.
Wake window calculator
Find your baby's typical awake time between naps, based on their age.
Epworth Sleepiness Scale
The standard 8-question daytime sleepiness screener, with score bands. Not a diagnosis.
STOP-BANG questionnaire
An 8-question sleep apnea risk screener used by clinicians. Not a diagnosis.
Sleep guides
To better understand and improve your sleep
Sleep hours by age
Understanding sleep cycles
Tired after waking up
Ideal nap duration
Repay your sleep debt
Sleep hygiene vs insomnia
Screens & blue light
Ideal bedroom temperature
Exercise & sleep
Diet & sleep
Daylight saving time
Snoring & sleep apnea
Weekend sleep debt
Best mattress by position
Best pillow for sleep
Melatonin guide
Best mattress for back/hip/shoulder pain
When to replace mattress or pillow
Anti-snoring products that work
Sleep for night-shift workers
Sleep by life stage
Recommendations tailored to your situation
Frequently asked questions
How does the sleep calculator work?
It adds or subtracts 90-minute sleep cycles from the time you enter, adding an average of 14 minutes to fall asleep.
How many sleep cycles do I need per night?
Most adults need 5 to 6 full cycles, about 7.5 to 9 hours of sleep.
Why does waking up between cycles matter?
Waking up in deep sleep causes sleep inertia: grogginess and confusion. Waking up in light sleep, at the end of a cycle, limits this effect.
Is Dozofy free?
Yes, all tools are free, with no sign-up or usage limit.