Ck101,

Welcome to NeuroTalk.

As Doozer says, the 24 hour delay is a common part of PCS. My thought is it has to do with adrenaline or another similar system that gives extra energy and wellbeing. We get started on a good day and get these chemicals and neurotransmitters flowing strong and make it through the day with the normal symptoms being masked by these feel good chemicals. Then we sleep through the night or at least try to sleep through the night and wake up with the accumulated fatigue.

It's like using coffee to push through a multiday task with inadequate sleep. Eventually, the caffeine cannot overcome the need for sleep.

For me, early in my progress, it could take up to 2 weeks to get back to normal.