Have been doing it all through lockdown on and off ( couldn’t get hotel in London, couldn’t stay at shielding relatives like I would have normally, too far to drive home safely after nights and no way getting on the tube ) and it’s not that bad . Either stretch out in drivers seat with pillow and duvet , or curl up in back seat like dormouse . In a secure compound so not concerned re safety . Then wake up , nip up to petrol station for a coffee , and food , back to work , shower and good to go . Easy. There were about a dozen of us at one point doing the same