Item #3 of 10

The stage of sleep marked by the production of delta waves is __________ sleep.

stage 1;
stage 2;
stage 3;
stage 4;
both stages 3 and 4;

CORRECT - Yes, both stage 3 and 4 sleep are characterized by delta waves.

[Review Part 1 of the tutorial] [Review Part 2 (Matching) of the tutorial]