The active ingredient in Restyl 0.25 is alprazolam, a sedative-anxiolytic that can sometimes cause a 'hangover effect' the next day. Even at a low dose of 0.25 mg, it can lead to mild disorientation, drowsiness, or temporary memory difficulties the following morning, especially if your body processes the medicine slowly. Please do not worry, as these side effects are usually temporary. Avoid driving or tasks requiring intense focus while feeling this way. I highly recommend speaking with your prescribing doctor, who can safely adjust the timing of your dose or suggest an alternative to ensure you feel better.