Is it possible I am seeing lights flicker with mains frequency?

I was going to automatically say yes, then decided to google first. Here’s an interesting link that lists your fatigue as a contributing factor.

I use to have a terrible time with the 60Hz refresh rate on old CRT type monitors.

Absolutely it is possible. If the ballasts are staring to get old or are failing you can see the flicker easily – no super powers required.

Actually you can see much faster than 60 Hz. Here’s an experiment for you.
The next time you are on the highway at night, look at the taillights of the cars ahead of you. Move your heard from side to side and watch the taillights. .About ⅓ of the cars will have high speed LED taillights flashing at around 500 Hz to 1 kHz. (This is an estimate as every manufacturer is different) As you move your eyes, the cars equipped with incandescent taillight will produce an image of smooth red lines. The LED equipped cars will produce a series of flashes. Give it a try.

I certainly see it. The lighting in my kitchen is particularly aggravating. Thanks to @bossob for the terrific information provided in the link above. Time to convert to LED lighting.

Of course the flicker. It’s physics and easily measured.
From the link that @bossob posted:
Flicker at line current frequency.. “The flicker is at 100 or 120 Hz (half-cycles for 50 or 60 Hz current), which theoretically cannot be perceived.”
We can definitely see it.

Try the experiment. Open your hand and spread your fingers. Put your hand in line with a fluorescent bulb and move your hand back and forth like a strobe. You will see the flashes. Now look at an incandescent bulb. No flashes. Here’s another experiment. Take a video with your digital camera of a florescent bulb. Now take one of an incandescent The fluorescent will strobe. the incandescent will not. Try to take a high speed picture. You will catch the F bulb off or on or even half way!

Humans can see a lot faster than we think. Look at HDTV and specs they are pushing.