Here's the thing that I hate about early morning shifts (i.e. before 8am). You pretty much HAVE to call out the night before if there's any hope of them being able to get someone to cover you, and if you can't, then you have to wait until 7:30 to call (PAST your shift) because at my store, there's often not someone in the building prior to that who can take call-offs. I've had plenty of times where I was miserable the night before, but had no way of knowing if I'd feel better or the same in the morning, so I had to call off just in case. If I had an LOD who would let me sleep on it and then not come in the morning if I still wasn't feeling well, sure, but I feel like for really early shifts, they won't give you that option.