wifi dropping same time every night

Every night about 8:00 PM I lose all wifi internet connectivity.  When opening a browser , I get a message that no internet is available.  However, when checking my desktop computer that is directly plugged into the router(linksys E1500) it tests fine .  Up to 60 Mbps or better.  This goes on all night until about 6:00 AM.  Then connection comes back and all is well-until 8:00 PM again.  I do not think it could be a bandwidth issue since my desktop -plugged into the router-is great.  ANy help would be appreciated.   Thanks