What would you do.

Yes probably lots of seemingly incompatible relationships. Depends how much it affects you yelrah?

I am an early to bed early to rise and my OH is a night owl and will sleep most of the day when he's not working.

Doesn't bother me in the slightest because I just do my own thing. He is great in other areas such as housework etc (while I am out).

All depends on the individual I guess. Do you love him? Does leaving seem a better option?

One thing for certain is....don't try to change him. It will just cause more friction and upset.

By all means talk to him and explain how you feel but be prepared for something you may not want? Personally I would HATE it if my OH decided to spend all night speaking to me ha ha ha. I like to go and read in peace!

I would certainly ask him to get checked out with his GP - sleep problems with type 2 diabetes can be a sign that his blood sugar isn't being properly controlled and also that he may have sleep apnea (very common with diabetes) which can be very dangerous if not treated. Disturbed sleep patterns can also be a sign of depression. It sounds as though you're not happy with the current situation, so no good telling you to adapt to it. Tell him that you're worried about his health and it would help you if he got checked out (that you could then stop worrying). Try telling him that you're lonely and that this isn't how you pictured your retirement, and that you don't think you can do this for another 20 years (or more)? You could try making a lot of noise during the day to wake him up?? But, in the end, if he won't budge, then you have to make some very difficult decisions about whether this is the man you want to grow old with.

My husband has always been a night owl but since I had the menopause , some 10 years now his occasional late night has become the normal. His average time of retiring is 1 am but lately this has extended to 3 even 4 am mainly because he falls asleep in the chair but would not admit he is tired..
When this first happen I suspected an affair as our sex life went from very active to almost nothing over night (DH being the most active) but as time went by I realised it was the menopause that put him off sex nothing else.
However my problem was more to do with the fact I am an early bird and get up at the crack of dawn and my DH can stay in bed these days until after noon. What to do, I did for a while worry he's ill, get angry because he is being lazy and finally got fed up. Those emotions failed and had absolutely no effect on his sleeping habits at all to the extent that when we had builders in to do renovation work they carried on banging, loud music etc and DH still did not get out of bed until 10.30am much to the amusement of the builders.
I felt I needed to change tactics.
Now, I will either go for a swim, do the gym and have leisurely Jacuzzi or go for a long walk across the fields foraging or gardening or just sit and read a book, listen to music without any cross examining or disapproving looks or grunting. Everything I want to do;but do not always get the chance, is done before he even gets out of bed. It is never discussed what I get up to between 6am-noon. I do tell him what I have been doing but he is not that bothered Our day starts together now at Noon, he is still working part time and go straight to his 'office' before coming down stairs. We are now in the routine without any arguments.
I love it as I get 'me time' of at least 3 hours a day, long may it last!