Sleep Calculator
Your Schedule
Fill in the form to see your personalized sleep schedule with wind-down times and UTC equivalents.
🌍 Global Sleep Comparison
Average nightly sleep duration by country. Your region is highlighted in green. Yellow line = global average.
Sleep Architecture — A Full Night
Healthy sleep cycles through stages roughly every 90 minutes. Deep sleep (N3) dominates early; REM lengthens toward morning. Each stage serves a different restorative function.
Awake
Brief awakenings at the end of cycles are normal and usually forgotten. Extended waking (>20 min) fragments sleep and reduces quality.
N1 — Drowsy
The transition into sleep. Brain activity slows, muscles relax, and hypnic jerks may occur. Very light — easily woken by sound or light.
N2 — Light Sleep
True sleep. Heart rate slows, body temperature drops. Sleep spindles help consolidate memory. Makes up roughly 50% of a night's sleep.
N3 — Deep Sleep
Slow-wave sleep. Physical restoration, immune function, and growth hormone release. Hardest to wake from. Responsible for feeling truly refreshed.
REM — Dreaming
Rapid Eye Movement. Vivid dreams, emotional processing, creativity, and long-term memory consolidation. Brain activity nearly matches waking levels.
🌅 Wind-Down Protocol
🔅 Dim the Lights
- Reduce overhead lighting by 50%
- Switch to warm amber or red-tinted lamps
- Avoid bright white or blue-tinted lights
- No more caffeine (ideally 6 h before bed)
- Finish any high-intensity exercise for the day
📵 Screen Sunset
- Enable Night Shift / Night Mode on all devices
- Reduce screen brightness to minimum
- Finish urgent tasks — allow work to end
- Light snack if hungry (avoid heavy meals)
- Take a warm bath or shower
📖 Quiet Time
- Put away all screens (phone, TV, laptop)
- Read a physical book or magazine
- Gentle yoga or stretching
- Brain dump: write tomorrow's tasks so they leave your head
- Gratitude journaling
🧘 Prepare Your Space
- Set room temperature to 18–20 °C (65–68 °F)
- Blackout curtains or sleep mask
- 4-7-8 breathing: inhale 4 s, hold 7 s, exhale 8 s
- Progressive muscle relaxation (tense + release each group)
- No clock-watching — turn clock face away
🌑 Sleep Environment
- Completely dark room
- Phone face-down or in another room
- White or pink noise if needed
- Only use bed for sleep — this conditions your brain
💡 Blue Light & Your Brain
Blue light (~480 nm) suppresses melatonin — the hormone that signals it's time to sleep. Screens emit ~35% blue light.
What to do:
- 🌙 Use f.lux, Night Shift (iOS/macOS) or Night Light (Android/Windows)
- 🕶️ Amber-tinted blue-blocking glasses in the evening
- 🔅 Set all screens to minimum brightness after sunset
- 📵 Ideally: no screens 60–90 min before bed
🌡️ Ideal Sleep Environment
Temperature
65–68 °F (18–20 °C). Your body needs to drop ~1–2 °C to initiate and maintain sleep.
Darkness
Even dim light suppresses melatonin. Blackout curtains or a sleep mask are highly effective.
Noise
White or pink noise masks disruptive sounds. A fan, noise machine, or app works well. Earplugs also effective.
Bed Association
Use your bed only for sleep and sex. This trains your brain to associate the bed with sleepiness.
😴 Trouble Falling Asleep?
Stimulus Control Therapy
One of the most evidence-backed treatments for insomnia:
- Only go to bed when genuinely sleepy — not just tired
- If not asleep in ~20 min, get up and do something quiet in dim light
- Return to bed only when sleepy again — repeat as needed
- Results improve noticeably within 1–2 weeks of consistency
- Same wake time every day, including weekends
Cognitive Techniques
Anxiety about not sleeping often makes insomnia worse:
- Challenge catastrophic thoughts ("I'll be destroyed tomorrow")
- Cognitive defusion: observe thoughts without engaging them
- Paradoxical intention: try to stay awake instead of forcing sleep
- Mindfulness: focus on breath and body sensations, not the act of sleeping
Sleep Restriction (CBT-I)
For chronic insomnia, temporarily limiting time in bed consolidates sleep:
- Track sleep for 1–2 weeks with a sleep diary
- Limit time in bed to your average actual sleep time
- As efficiency improves (>85%), extend bedtime by 15 min per week
- Best done with a sleep therapist or CBT-I program
What to Avoid
- Naps longer than 20–30 min, especially after 3 PM
- Alcohol — disrupts REM and causes early awakening
- Caffeine within 6 hours of bedtime
- Heavy meals within 2–3 hours of bed
- Intense exercise within 2 hours of bed
- Looking at the clock when awake at night
🌛 Waking Up During the Night
🔍 Common Causes
Sleep apnea, stress, temperature, needing to urinate, noise, light, alcohol, anxiety, or simply surfacing at the end of a 90-minute cycle — which is normal.
⏰ Normal vs. Problem
Brief awakenings between cycles (~every 90 min) are normal and usually forgotten. It becomes a problem when you stay awake >20 min or feel unrefreshed every morning.
🛠️ In the Moment
Keep the room cool and dark. Don't look at the clock. If awake >20 min, get up briefly to a dim room. Write down any worries to address tomorrow.