The Americans had probably been lost while he was on the last sleep cycle.

When completed, the research results may help those with irregular sleep cycles.

You just have to get used to them before your sleep cycles adjust.

However, medical students have disturbed sleep cycle in these periods.

A sleep cycle can last approximately 70 to 120 minutes and be repeated four to six times a night.

He's having a sleep cycle now, otherwise I wouldn't be here.

I was on my sleep cycle, and everything was fine.

The best news at the moment was their disrupted sleep cycle.

Any more time, and the body enters into its usual sleep cycle.

Who else could be roaming around up here at this time of the sleep cycle?