Is there more information on this? I've always had issues with sleep and have determined my rhythm is between 27 and 36 with the solstice and equinox having the largest sway of insomniac and especially heavy sleeping.

I'm tempted to relate it to my severe MDD but with no income it's impossible to see a doctor of any variety it seems, so all self-research and testing. I'm leaning this way as for instance I can end up having more than 36hrs a cycle but never less than 24 due to being awake especially long with either especially long sleep along with not being able to return to sleep ever unless I'm especially exhausted.