Verb
To draw along as a current does; as, water entrained by steam.
To put aboard a railway train; as, to entrain a regiment.
To go aboard a railway train; as, the troops entrained at the station.
Source: Webster's dictionaryAmong blind people, the cause is the inability to register, and therefore to entrain to, light cues. Source: Internet
Because normal people cannot entrain to a 28-hour day in dim light if at all, this is referred to as a forced desynchrony protocol. Source: Internet