I knew I could count on you to start topics
That was funny! Tungsten mashmallows, what on earth would you be dreaming about? XD
I usually don't have a sense of time passing. At all.
If I take a nap I never know whether it's been 5 minutes or 1 hours. More often than not I'm not really sure whether I've slept at all!
If you ask my son, he'll tell you he never sleeps.
Not even after a whole night slept (which for him is 10+ hours), no, he'll claim he was awake all the time xD
And about forgeting deliberately... impossible.
I tend to obsess over things. If I wanted to forget something I would just be thinking about it all the time.