Individual dolphins also enter a deeper form of sleep, mostly at night.
个别海豚也会睡得较沉，特别是在夜间。
In captivity, the giraffe sleeps intermittently around 4.6 hours per day, mostly at night.
笼子里的长颈鹿每天大约会断断续续地睡4.6小时，大部分时间是在晚上。
In captivity, the giraffe sleeps intermittently around 4.6 hours per day, mostly at night.
笼子里的长颈鹿每天大约会断断续续地睡4.6小时，大部分时间是在晚上。
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