Sleep Cycle Alarm Clock

Updated 26 June 2026

Phone plugged into charger and lying on bed next to pillow. Text reads: "Sleep Cycle tracks your sleep patterns"

Phone app interface with line graph showing changes in depth of sleep over a night. Text reads "...and wakes you up during light sleep."

Phone app shows an alarm going off at 7:12am with a snooze button. Text reads "Waking up during light sleep feels like..."

Sleep Cycle Alarm Clock is an intelligent alarm clock that analyzes your sleep and wakes you in the lightest sleep phase – the natural way to wake up feeling rested and relaxed.

As you sleep you go through different phases, ranging from deep sleep to light sleep. The phase you are in when your alarm goes off is critical for how tired you will feel when you wake up.

Since you move differently in bed during the different phases, Sleep Cycle can use the accelerometer in your iPhone to monitor your movement and determine which sleep phase you are in.

Sleep Cycle wakes you when you are in your lightest sleep phase.