Describe the general trend of brain wave voltage and frequency as a person transitions from stage N1 to stage N3 sleep.

As a person moves from stage N1 to N3 sleep, the voltage of brain waves increases, while the frequency decreases.

What are the two distinct EEG features observed during stage N2 sleep?

The two distinct EEG features observed during stage N2 sleep are K complexes and sleep spindles.

As time passes during the night, less time is spent in stage three sleep.

Dreaming most commonly occurs during REM sleep, and brain activity during this stage is similar to that of a person who is awake.

I can describe the different stages of sleep and cycles of sleep and their corresponding brain wave patterns.

1
During stage two (N2) sleep, EEGs show K complexes, which involve a large negative wave followed by a large positive wave, and sleep spindles, which are brief bursts of 12 to 14 hertz waves.
2
One cycle through the stages of sleep lasts approximately 90 minutes, and as time passes, more time will be spent in stage one and less time will be spent in stage three.
3
Recuperation theories propose that wakefulness disrupts homeostasis, while adaptation theories propose that we evolved to sleep at night because darkness is dangerous.