Oil Pressure Light Intermittently On

After being parked for about fifteen minutes, my oil pressure light (yellow) came on when I started the car. I immediately parked, turned off the car, and checked the oil level. The oil wasn’t totally full, but didn’t appear to be below minimums either. When I replaced the dipstick and restarted the car, the light went off. I drove for about 20 minutes and then left it parked for a couple of days.

After sitting for a couple of days, I started it and the light didn’t come on. I drove most of the day and it didn’t show any signs of abnormal operation until I parked it again that night. As soon as I parked, the light came back on. Repeated the oil check, replaced the dipstick, light went back off.

Any theories as to why it goes off after I check the oil level? I plan to contact my mechanic soon, but I’d love to have an idea if it’s safe to drive to work for the weekend.