Stage N1 Sleep
Eeg recordings showing all three stages of typical nremsleep. In healthy adults, sleep typically begins with nremsleep. The pattern of clear rhythmic alpha activity associated with wakefulness gives way to n1, the first stage of sleep, which is defined by a low-voltage, mixed-frequency pattern.
Following symptoms were assessed in the questionnaire: excessive fatigue or sleepiness, falling asleep during the day, waking up tired, inattention (trouble paying attention due to sleepiness), snoring, stopped breathing during sleep,insomnia and leg jerks during sleep.
A high percentage of the stage n1 sleep is generally a result of frequent arousals caused by sleep disorders, like sleep apnea, periodic movement of sleep, or snoring. Other causes of sleep disruption, including environmental disturbances, may also lead to increased amount of stage n1 sleep.