Theres no doubt that a lack of sound sleep can increase depressive episodes.....lived it.
Try to exersize,get out in the fresh air,and try to gain a pattern for bedtimes and wake ups.
In my experience the worse my depression is the more disturbed my sleep is.I need at least 8 hrs sleep.....but on weekends I sleep 10-11hrs......I blame my depession on this as well.
Try those tips.
Hope it helps.