Hypnograms
Hypnograms show a timeline of your stages of sleep through the night. A normal sleep will have several cycles of light, deep, and REM sleep, interspersed with brief periods of being awake (which you most likely won't remember). Deep sleep is more common in the first half of the night, and REM sleep more common towards the morning.
Sleep State Percentage Bars
State percentage bars show the cumulative amounts of time you spent in each sleep state. Although normal percentages vary depending on age and individual, common numbers are:
10% Awake
50% Light Sleep
20% Deep Sleep
20% REM Sleep
Light Sleep
Light sleep comprises the majority of our sleep. During this stage we can be woken easily. Light sleep is stages 1 and 2 of Non-REM sleep.
Deep Sleep
Early in the night we spend more time in deep sleep. It is more difficult to wake us from this state, and doing so will cause unpleasant sleep inertia. Deep sleep is stage 3 of Non-REM sleep.
REM Sleep
REM sleep is when we dream. During this stage of sleep we are partially paralysed, to stop us from physically acting out our dreams. It is common to be briefly awake after each period of REM sleep, although we most often will not recall waking.
Initial Sleep Onset
Sleep onset latency is the time between when you pressed Start and when you fell asleep. This measure is an effective indicator of degree of sleepiness. A common number is 15 minutes, with shorter times indicating greater sleepiness and longer times indicating less sleepiness.