Thanks @kmakm,
In the old days, I'd even just use a 1/2 a Temase just to 'get me asleep' as back then, that was enough to get me about 5-6hrs a sleep - but not now! :( I've tried whole ones recently & they don't often work at all! I'd always been told not to use them more than 3 days running due to their addictive nature .....
Yeah - they were never designed to give you more than 3-4hrs sleep anyway. :(
ah well .... good excuse to get out yak fishing again ... soon! ;) But as you say, not sustainable really!