After hours guest contacts

For smaller STR operators, how do you handle after hours guest issues/contacts? It doesn’t happen often, but occasionally I get guests reaching out after I go to sleep. I’ve change my phone settings to allow calls/texts from Airbnb & Hospitable to come through. I got a contact recently from a guest that I didn’t hear until seeing it when I woke up. Just trying to get ideas to address this process issue without blowing up my costs.