That shit is the worst. When I'd detox I would be awake for 3-5 days with no sleep at all and then be in a delirium for 4-5 more days with occasional sleep of 20-30 minutes at a time every few hours with waking dreams, never really knowing if I was awake or not when I was awake. It would take about 2 weeks to stop feeling sick, start eating and get any kind of "normal" sleep again.