I've read some stuff on a few forum about cramping but most of it seems to apply to during or immediately after exercise. Last Sunday I did 70 miles for the first time. Felt great,could have done more, ate appropriatelt and drank about a gallon of liquid before ,during and immediately after. Used some of the liquid as gatorade enduarnce mixed w iced teas(splenda stuff). Finsihed ride at 3 pm and had pizza and salad for dinner with lots of salt. When I settled down to sleep at about 11 pm the cramps started in my thighs(where I felt no tiredness or any sign before WHAM...cramp). I read all kinds of stuff, more salt(I ate more by 1/2 tsp full!),took Tums for Cal/mag,drank ovaltine in milk. After about 2 hours I was able to sleep.
Today worked in garden for several hours hauling mulch and weeding, then rode 39 miles. Drank lots of liquids including the gatorade endurance stuff, Had a salty mexican dinner and just settled in to bed ...WHAM my thighs are cramping. I can't believe it's just salt that's doing this delayed cramps. I will order some endurlyte tabs or something but just wondering if anyone has pinpointed for themselves which chemical induces this late night stuff?