Vyvanse+ambien combo, a good idea?

Im am having trouble staying awake long enough to be able to trip on ambien so i thought i might take a 50mg does of vyvanse to keep me awake for the trip. Will this work? Keep in mind that vyvanse is different from adderall in the fact that it doesnt give you that instant euphoric rush like adderall even though it also contains d-amphetamines, but they combined l-lysine to it to keep you from getting that rush of speed and euphoria because of substance abuse. The d-amphetamines are slowly released into the body as it is digested in the body over a 10-12 hour period. Now if i took 20mg of ambien and 50mg of vyvanse what that keep me awake for the trip without one overpowering the other and without strainning my heart?