Hull made me recalibrate tbh. I think I can ride a daytime 100km without batting an eyelid. I used to be able to go without a night's sleep, and just shrug it off. I can't sleep before a ride. I've tried, but no.
The intensity of my current gig with sleep debt before I start, a reduction in cycling fitness from relatively little exercise this summer, and cycling endurance fitness at that, and riding 100km overnight, left me in a very bad place on the night/morning, I just didn't get a second wind after the stop, though thanks to a few in here I pulled myself together, and felt less than 100% for about three days afterwards. The last time that happened was first Whitstable.