I am an old guy so pardon me from stating the obvious. If you are able- the very best chemicals come from inside you so if you can force yourself to get some exercise by walking etc. The first thing in the morning really helps. No matter which doctor you get they always add exercise if you can at the end of the visit . Its a struggle I fight each day . I like to put myself first, riding my bike or a walk at dawn , then the shower ,then some hot tea- earl grey for sure. lifts my spirits and the depression eases.
Yes we all have sleep problems when we get older but there are some things you can do . I have had the sleep study, I was on the sleep apnea cpap machine but I exercised and lost weight - got off the machine . No more reflux etc. I'm developing better sleep habits, it takes some work . I miss the sleep of the dead from my youth! oh well !!!. Good luck to you .