[[Special:MyLanguage/Biphasic|Biphasic]] sleep is often used for the recovery as well. Having two blocks of sleep, it is possible to use an alarm for one of them, without restrictions for the second one.
二相睡眠也是被常用的回復類型。因爲這種時程有兩個睡眠段落，可以對其中一個中使用鬧鐘，而對第二個不設限制。
