I am in your club, too.
I tried 'Sleepio', an on-line course of sessions in which one is taught various facts regarding sleep and encouraged to do this and that. The hardest bit for me was, if unable to sleep for half an hour or so, to get up out of bed, go downstairs and undertake an activity, only returning to bed when actively tired. I just couldn't do this on cold wintery nights, so failed to complete the course. Sleepio may be helpful for others.
The Sleepio course emphasises the fact that bedrooms are for sleep only (perhaps the writer is not married?!) so one is not supposed to do anything other than sleep there.
Overall Sleepio is helpful and may be beneficial for others.
My natural bedtime is growing later and later and is now around 3.00 am. I know, I know and yes, it is late (or early!) but I am now able to go to sleep whereas previously I just tossed and turned for many hours.
I have also begun warming the bedroom more than I used to do and this I also find helpful (Mr C isn't impressed).
I have resorted to Piriton (an antihistamine containing chlorphenamine) which if only taken occasionally, can help one to drift off. If it is taken daily the effect wears off.
I am reluctant to take prescription sleeping pills but understand that this is necessary for some. Melatonin and magnesium should be cleared by your GP if you take other medications.
Don't take a compilation of sleep-enhancing items as there could be an accumulative effect on breathing.
I am sure that we all know that the bedroom should not feel too hot or cold; that we do not use our mobiles/PCs for at least half an hour before bed; that we have a milky drink and a warm bath prior to retiring but despite all of this, many of us still can't sleep!
Thank to everyone for suggestions shere, I will try them and see if I can be ready for sleep a little earlier.
I wish everyone a good night's sleep - the best feeling in the world - almost...