meditation would really help but he'd obviously have to be open to that kind of thing. I used to have really terrible sleepless nights then I learnt a form of meditation called TM. I couldn't believe the fantastic sleep I had after doing it for the first few times.
1. He should always be going to bed at the same time, if possible.
2. No caffeine within a few hours of sleep.
3. No serious exercise within a few hours of sleep.
4. Not much alcohol before sleep.
5. Develop a bedtime routine (e.g. reading, or TM as recommended, or a bath) and stick to it.
6. If possible, when travelling, can he bring something to make the different bed familiar? e.g. a pillow? Or I'd be inclined to use a white noise machine at home and use the same kind when travelling?
7. I often find having white carb before sleep helps me fall asleep.
It's worth trying to work out what makes the difference - for me, sound is a big deal for sleep. For DH, he can't stand any light when he's trying to sleep.
I learnt with these people NBG (have a look at the 'What is TM?' and 'Evidence' pages
they do courses in London Manchester and Newcastle and it was just a weekend course. I heard about it on MN actually (I think it was Countess Dracula that recommended it). The 'original' TM foundation charge over £1000 to learn but these guys set up their own teaching after becoming disillusioned by the amount being charged. I can't praise it highly enough and it's not weird chanting, sandal wearing oddness. It's actually just a very simple technique that has amazing results.
2 calmag tablets as you get into bed. The magnesium apparently relaxes the muscles and helps you sleep. A friend of mine whose husband has similar sleep issues swears by them. If he wakes up in the night, he takes 2 more and it helps him go back to sleep.