Hopefully your therapist will have some suggestions for working with you to break the cycle of oversleeping. As you may know I've had a huge amount of difficulty with that myself, and I still am.
You also know that sleeping to much is bad for depression, it can make it worse, so it is also a very bad cycle.
But there are ways to help it. Some suggestions I got are to stay out of the bedroom all day except for sleeping. Don't read or eat or watch TV in bed, so that you don't have a brain connection between those other activities and sleeping. try to keep on a schedule, bed same time, wake same time. Once out of bed don't succumb to a nap, try to get out, stay active, and do something instead (that's what I'm having difficulty with right now). Don't watch TV right before bed, don't eat right before bed (some of these are suggestions for people having trouble sleeping, but in some ways it is all the same "cycle" that has to be fixed.
Keep in touch with you pdoc about this too. he is trying to balance other things with your meds in addition to sleep, so stick with his recommendations unless you feel he is not being responsive to what you tell him (if it is that bad it may be time to find a new pdoc). At some point they put me on Wellbutrin to help with my depression and it is also an energy booster... if I take it too late I can't sleep at all. That does seem to help me quite a bit, but it also made me overanxious so they started me on something else to help with that.
So there can be some medicinal adjustments that may help. I think the best thing is to make sure you keep telling your therapist and your pdoc about the status of your sleeping so they can help you break the problem.
I'm not no longer sleeping long hours at night, so I've made reasonable improvement. I still have trouble napping midday though.
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