Rare card
Sleep cycle
- Value
- 50 W
- Attack
- 276
- Defence
- 221
- Players
- 0
The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and wakefulness.
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