Waking up easy is all about timing. Sleep Cycle alarm clock tracks your sleep patterns and wakes you up during light sleep. Waking up during light sleep feels like waking up naturally rested without an alarm clock.
While you sleep, you go through a cycle of sleep phases. The first phase is light sleep, followed by deep sleep and a dream state referred to as REM-sleep. A full sleep cycle lasts about 90 minutes and is normally repeated several times each night.
Sleep Cycle alarm clock
Your movements vary with each sleep phase. Sleep Cycle uses the phone’s accelerometer to identify sleep phases by tracking movements in bed. Sleep Cycle then wakes you up during your lightest sleep phase, using a predefined 30-minute alarm window.
Examples of real life sleep graphs generated by Sleep Cycle alarm clock
Example 1 – Regular sleep
This graph shows peaks about 90 minutes apart. The peaks represent sleep cycles, including all sleep phases described above. This is a great example of a sleep graph showing regular sleep patterns.
Example 2 – Irregular sleep
This graph shows more irregular sleep where the user probably didn’t sleep as well as in our first example. Here the user remained in lighter sleep phase 2am-4am and woke up for a short period of time at 7.30am.
Example 3 – Untracked sleep
This is what a sleep graph will look like if the phone has trouble sensing your movements in bed. If you experience this, make sure to redo the placement test. You can find the placement test in your Sleep Cycle app under Instructions. During the placement test, your phone should make a sound each time you move. If you’re having difficulties getting it to work, try placing the phone closer to your body.
Example 4 – Disturbed sleep
The graph shows how alcohol influence can disrupt your sleep cycles. Although alcohol can make you fall asleep faster, it will make it harder for you to sustain a good nights sleep. The user in our example occasionally enters deep sleep during the first half of the night, but remains in lights sleep altered with period of being awake for the second half.