My experience was erratically alternating between not being able to sleep (sleeping less than four hours per night) and sleeping 12-18 hours per day. Either mod

My experience was erratically alternating between not being able to sleep (sleeping less than four hours per night) and sleeping 12-18 hours per day. Either mode could last half a week, or a whole month. Many (most?) depressed individuals do experience sleeplessness, but that's not at all universal.