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Most routers have an automatic power-saving mode that kicks in at night, and if yours is set too aggressive it'll drop the connection to save energy - worth checking your router settings to see if there's a schedule or sleep mode enabled. The heat and interference stuff others mentioned definitely matters too, but that power management angle gets overlooked a lot.
WiFi disconnecting at night usually points to interference or thermal issues - your router might be overheating after running all day, or interference from other devices peaks during evening hours when more people are using wireless networks nearby. It could also be a weak signal if you're far from the router, since nighttime usage patterns sometimes expose dead zones you don't notice during the day. Try moving your router to a more central location, keeping it away from microwaves or cordless phones, or just giving it a hard reset and seeing if the problem clears up. If it keeps happening, check your router's logs or contact your ISP to rule out line issues on their end.
I've noticed mine drops mostly around 11 PM to midnight, and it's almost always been the router getting throttled from heat buildup. Try moving your router to a spot with better airflow - away from walls, enclosed spaces, or near other equipment that generates warmth. Sometimes just giving it breathing room fixes the whole thing. If that doesn't work, check if anything's on a schedule at night (like automatic backups or updates on your devices) that could be hammering the connection.
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