Unable to sleep diagnosed hypomania

Hi so for the past month iv become hypomanic after starting lexapro... I have stopped(unwillingly but had no choice to) i talked to a psychiatrist and he explained that im currently hypomanic and really really need to get sleep iv been 2 days slept for 22 hours after then slept for 9 hours and now im probably gonna stay awake anouther 2 days... I really dont wanna crash I wanna maintain this state of euphoria please tell me some way i can sleep i jsut cant lay down.. i feel amazing and the thought of sleeping or laying down just makes me so fucning angry but I'm afraid ill crash into depression this is really urgent for me please what can I do to sleep its 8 43 am in the morning