fenugreek, night nursing... help!

My baby would stay latched on all night, on top of me, if I let him - at 13 months and 24 pounds, ooof! But I can tell that his nursing gets to be comfort nursing at some point, that little fluttery suck where he's not swallowing. He would happily sleep on top of me with my nipple in his mouth all night. So when he's deep asleep and doing that, I do the Pantley pull off trick (from the No Cry Sleep Solution) where I delatch him and then gently hold his chin up to keep his mouth shut, and he will usually stay asleep after that. He does spend a couple hours in the morning snuggling and snacking, but I don't mind being half-awake in the morning nearly as much as I do in the dead of night.

You're probably dead tired when they do this, but can you observe them for a few nights and see whether they're actually nursing or whether they're comfort sucking? I don't mean to dis comfort sucking and its importance, but when it interferes with your sleep, it's a problem.

I would try weaning them from the habit of sleeping latched on to see if you can gently get them used to sleeping without the breast. Personally, I would be inclined not to take fenugreek to up your supply if it's a comfort/behavioral thing rather than a hunger thing for them.

I would guess that they are more nursing out of comfort/habit and just like having that nipple in their mouth-plus a little milk here and there isn't bad either! I doubt it's an under-supply problem or even a hunger-based thing at this point (though I could be wrong, but you should be able to tell if they're nursing out of hunger or for comfort, right?). If they are really nursing up a storm and are obviously hungry maybe you could try to make sure they get a good amount of milk in their tummies before they fall asleep? My DD used to drift off before she had really nursed long enough to be full, and then would wake up ravenous and crabby an hour later. I used to have to keep her stimulated at the night-time nursing to make sure she got a complete nursing and that helped her to sleep longer.
With my DS I used to sneak a pacifier into his mouth after he was deeply asleep and I had unlatched him. It was the only way I could get some sleep, and it helped him to sleep longer periods without waking (he was one who woke every 20 mn or so to latch on, until he was about 12 mnths old). He never used a pacifier at any other time, but it did buy me some extra zzzs when he was a babe.