Vicar I sympathise, I really do but getting out of bedmate getting showered and getting out of the house will make you feel so much better, truly.
The law in my house is that, nobody is allowed downstairs in the morning in their pjs and you must be clean to wear clean clothes.
These rules are the only thing that stops me crawling back into bed straight away. It is not good. I remember the tiredness vividly but found that the more I slept, the more tired I felt. Then would be wide awake at 3 am, not get back to sleep and be knackered the next day. I do not let myself nap anymore, it means I get a better nights sleep and am more refreshed in the day.
My meeting with my boss went well. I was mega anxious last night, couldn't sleep and felt shit today. We have sorted out a plan for return to work on 15th jan.
Vicar 4-5 weeks is usually the turning point for ADs, try to drop the day time nap if you can, to sleep better at night.
Occ health will totally be on your side and if you say working night is a problem and affecting your health then your boss has a duty of care to make sure that alternative arrangements are made to enable you to return to work.
I have just read NHS sickness absence policy cover to cover, I know you don't work for the NHS but your employer still has a duty to look after you x