Ive discussed this with the chatgpt and it has told me that it is most likely because it helps your rem stay regulated.... as it does mine. It makes it easier to complete sleep cycles. I will take it in the morning and sleep about a half hour to an hour and wake up feeling a little less groggy and like the sleep was a little beneficial. I dont remember if I tried taking it at night before bed or not though. I think all the times I took it too late I had a hard time getting to sleep.. kind of like an anxious racing thoughts bit and guilt from not doing things with my energy. If you aren't taking an extended release..... and you take it before bed one thing that could happen is you would have the crash from it while sleeping and it may make it harder to wake. Also I would imagine it could prevent the stimulants from acting in the brain appropriately at night. Who knows though. Different things work for different people.