As a first-time MyWheels user with less than 5 rides in your account, you cannot make night rides (rides with a start- or endtime between 1:00AM and 06:00AM)
With less than 20 rides in your account, you cannot make spontaneous night rides between 10:00AM and 06:00AM. This means that between these two times you cannot make rides that have not been booked more than an hour in advance.