Sleep Calculator REM calculates your perfect
wake-up and bedtime windows based on 90-minute
REM sleep cycles.
Most people wake up groggy not because they
slept less — but because they woke up in the
middle of a sleep cycle. This tool fixes that.
🌙 3 Modes:
• Wake Up — enter bedtime, get best wake times
• Bedtime — enter wake time, get best bedtimes
• Sleep Now — instant calculation from now
✨ Features:
• Age-based sleep recommendations
• Visual REM cycle diagram
• Sleep debt calculat
