On a night like this, it's hard to tell someone else when it's ok to go to bed... you gotta make that call for yourself since it's your baby.
But... if it's later in the cycle and she's started to rise definitely on her own without food... I'd feel ok to go to sleep. Leave food out if you're nervous just in case, but you will want to be up in time to make sure to pull the food 2 hours before AMPS...assuming you're not going to skip the am dose.
The thing with Scout is that she not only seems to nadir later... she has also been trending lower and lower and has been slow to rise at the end of the cycle...