Research: Sleeping during commute has benefits

SAN FRANCISCO

The director of Columbia University's Medical Center found that people who sleep on buses, trains and planes likely benefit from it.

They probably only reach the lightest stages of relaxation -- stage one or two -- but that can be enough to re-invigorate morning commuters who got a bad night's sleep.

In the afternoon, those naps can be frustrating because a person might want to slide into stage three or four of sleep, which is the "deep sleep" phase.

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