I need sleep ,why am I deliberately causing damage to myself ?I will have an early night

I am old 70f and I am tired ,not just tired but almost dropping most days .Tired to the point I often feel dizzy and have had to stop driving due to this problem . Every afternoon I tell myself I will ihave an early night and I do often go to bed early (9 o'clock ish ) I listen to audiobooks on my phone but then I start scrolling reditt, reading up on news ,weather politics and lots of random stuff .I then make a pact with myself I will settle down to sleep at midnight as I can still get in 8 hours sleep and be up fir 8 in the morning. Midnight comes around and I have a desperate need for something to eat so I go go downstairs and make a hot drink and have a piece of cake or something or I might get crisps ,fruit and bring it back to bed .I often have a kind of picnic on the bed .I listen to my audiobooks for another hour or so. By now it's 1 o'clock in the morning .I will find anything to do except sleep -am often found sorting out wardrobes ,drawers etc during the night .Once back in bed I usually feel my eyes getting heavy but here is the strange thing I will fight it like children do.Its currently 1 o'clock in the morning now in the UK. I had promised myself an early night as I have to be up early on the morning (,7 o'clock) but here I am again knowing I only have 6 hours left to sleep but posting on here.My typical time for eventually dropping off to sleep is 5 in the morning but occasionally 6 , so I am averaging around 2/3 hours sleep at night .I use a cpap as I have sleep apnea.I often settle down only when my phone battery runs out.I am not on any social media only reditt. I often have to cancel plans due to exhaustion. in the last couple of years I have never slept more than 4 hours a night and it's killing me.I have always been a night owl but it's now got ridiculous and not good for my health. I have obviously tried leaving my phone downstairs but I just end up going back down for it at some silly o'clock time.Its like I am deliberately sabotaging myself and my life as its really taking its toll on my health and social life.I walk around in a daze ,been so tired I have fallen asleep walking and bumped into walls .I have fallen asleep on the toilet and fallen forward and cut my forehead open .In my ideal world I would sleep from 6 in the morning until 2 in the afternoon but society doesn't work like that .I never nap in the daytime. As I am typing now I am fighting to keep my eyes open. Why could I be doing this to myself deliberately fighting to stay awake at my age .I know tomorrows morning activity will be hard as I will feel as tired I will feel awful and have a headache. My eyes are feeling the strain too often red ,dry and dark shadows under then .During the daytime I don't go on my phone at all..To sum up its not insomnia it is me fighting sleep .I don't know what I am really expecting in response ,if anything butci am totally sick and tired (literally of it and myself ! Thankyou if you got this far .