I feel your pain. Have the same problem often. Trouble getting to sleep, trouble keeping asleep, waking at odd hours and can't get back to sleep. Such are the joys of old age!

It's not an issue now that I've retired. If I'm up from two till four and then sleep another three, no biggie.

well i have 2 breakfast to fix,,, one a 6 for my wife then pack her lunch and get her out the door at 7:25 then again at 8:45 for her mom. get her going and downstairs and make sure she takes her pills and checks her sugar then fix her breakfast,,, then clean up the dishes... so from 5am till 10am i am busy.

this is my retirement....  YAY !

I haven't used 'em in many years, but a couple of things that used to work for me 'way back. 

a) Tune in to an informative (?) radio program and try to pay attention / follow along.

b) Lay on my back in the waterbed  >> take the pillow away >> concentrate / keep thinking that my feet are rising up off the bed >> slowly "get" the rest of my body to follow suite [i.e. fool myself (?) into feeling that I was floating ... head slightly lower than my feet].

c)  ZzzZh... Zz..Zzhzz...ZzzZZ.  

YMMV ??????

I have that often,, I usually read a book til my eyelids start drooping. If that doesn’t work I get up a noodle on the muted banjo or guitar for a while.

Sherry’s comments fit my case. The result is that I generally keep late hours, heading to sleep usually after 11:30, but often not till 1 a.m., by which time I can usually get to sleep in less than an hour. So 9 or 10 a.m. is not an unusual waking time for me.

Yeah, I get up at the crack of noon.

I have to put the garbage out before 6:00 a.m., and I often stay up all night (maybe find movies on YouTube) and get to bed after it's out. This Monday I still wasn't sleepy, so got the bicycle out and went for a ride to the base and back.

Leave the TV and computer off 1 hour before bed. They both work with zillions of moving dots which keeps your eyes very awake and very nervous, even though you don't really feel strung out at the time. If you are over 65 don't eat or drink anything 3 hours before sleep. Keep the drapes pulled unless you want to be fully awake when the sun comes up now by about 6:15. Good non violent or non political reading material will shut me down within 30 minutes. I've adopted these methods out of a desperate need. Right around the age of 50 I started experiencing insomnia for no apparent reason. In 5 more weeks I'll be 78. Getting sleep as an older adult often needs some adjustment. A few basic rules has allowed me good sleep [most of the time] for the last 20+ years.. Don't expect immediate results from any or all of the good suggestions. Recently its been some very basic meditative techniques which have closed down the mental gong show within a few minutes of going to bed.

Yes, if like me, you will love retirement. You see, I always got up at 5am, took a shower and headed in to work. Usually there before 6am. Made the coffee, had a blissful time reading the news for a few, and then usually had more work done by 8 without anyone else being in the office. Still went home about 4pm depending on traffic.
Retired now, there is nothing on God's green earth I can do to stay asleep when 5am comes by. My mind seems to override everything else and begins it's new day without my authorization or consent. So I'll watch a little news, make a little breakfast, and later the old lady wants to know why I'm taking a nap at 10 in the morning. Go figure. Internal clocks may never be reset.

Nothing good happens after midnight anyway. Old wives tale? Unless you are single rich and attractive.?? which leaves me out. (And that’s how they became old wives…)

I dunno Mr. Ranch ... back when I was trying to farm the [old] combine ran better at night than in the day, and I would cultivate/disc more acres/hour after dark than during daytime, even though I'd be running same gear and same RPMs.   

 ... 50ish years with the same lady tells me that surely something right/good must have happened ..... IIRC, both before and after midnight.  

For thirty years I worked crazy hours. Fourteen of those years I worked Tuesdays and Wednesday from 9 in the morning until 5 in the afternoon, then Thursday, Friday, and Saturday I worked 7:30 in the evening until 4 in the morning. Eight of those years I worked 2:30 in the afternoon until 11 at night. four years I worked a regular 8 to 4 and the rest were 6:30 in the morning til 3 in the afternoon. Most of those years I was subject to callout. I feel best with 8hours of sleep a day, but it doesn't matter when I get it or if I get it all at one time or in pieces. I've been retired 15 years and I still do not have a sleep pattern. Old habits don't change.

i always got up a 5am when i was working and it is still auto pilot 5 years after retirement... but it all works out anyway..

up again at 3:45 ,,, tried to go back to sleep,, gave up at 5:15 and decided to come down to man cave and see whats going on.

..........   a-a-n--d .... ???      

... thinking about ^^ on a break from wheeling rotted manure onto the garden  >> biphasic sleep https://www.sleepfoundation.org/how-sleep-works/biphasic-sleep

yeah i got some manure for ours too,, going to till it under and set out our stuff. and sweety wants a rose garden. so i picked up a couple of orange roses yesterday for her.. she just won't tell me where she wants it.....