Yes, fluvoxamine (the active ingredient in Frext 50) can commonly disrupt sleep patterns and cause lethargy as your body adjusts to it. To help reset your body clock, your prescribing doctor may suggest shifting your dose to the morning if it keeps you awake at night, or to bedtime if it makes you drowsy during the day. Additionally, practising strict sleep hygiene, such as avoiding daytime naps, keeping a consistent sleep schedule, and limiting evening screen time, can help. Please consult your doctor before making any changes, as they can safely guide timing adjustments or discuss temporary medical options if necessary.