I can nod off very easily. The problem is being a light sleeper and waking up about 2 hours after nodding off and then frequently waking on and off all night between vivid dreams. I could quite easily then nod off again late morning (and often do)!
Nodding off is not usually a problem. Staying asleep long enough such that I don't go around all day in a daze, not being able to concerntrate as I did when I was younger, is a much bigger problem for me. Yet another laugh that my mind/body is having at my expense.
When I was younger I developed tha ability to sleep whilst stood bolt upright and at Attention. It's a special trick that stood me in good stead for many years
Sometimes there is a medical reason for not being able to sleep easily, a couple of things come to mind - thyroid problems and low iron or ferritin. Maybe if not already done you should get checked out for both if you feel it could be something like that. Hope that helps.