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Sleep Calculator

Find the best times to sleep and wake up based on 90-minute sleep cycles. Wake between cycles to feel refreshed.

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Recommended Bedtimes

Includes ~15 minutes to fall asleep. Aim for 5 or 6 cycles.

Sleep Quality Tips

  • 1
    Consistent schedule. Go to bed and wake up at the same time every day, even weekends. Your circadian rhythm thrives on consistency.
  • 2
    Screen-free wind-down. Stop screens 30-60 minutes before bed. Blue light suppresses melatonin production.
  • 3
    Cool bedroom. Keep your room between 60-67 degrees F (15-19 degrees C). Cool temperatures promote deeper sleep.
  • 4
    No caffeine after 2 PM. Caffeine has a half-life of 5-6 hours. An afternoon coffee can still affect sleep at midnight.
  • 5
    Finish eating 2-3 hours before bed. Late meals can cause discomfort and disrupt sleep cycles.
  • 6
    Complete cycles. Waking mid-cycle causes grogginess. Use this calculator to align your alarm with cycle endings.
  • 7
    Morning sunlight. Get 10-15 minutes of bright light within an hour of waking. It resets your circadian clock.
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Disclaimer: This tool is for informational and educational purposes only. It does not constitute medical or professional advice. Sleep needs vary by individual. Consult a healthcare provider for sleep disorders or concerns. StellarClose LLC is not liable for actions taken based on this tool.