I Get The Feeling Where Everything Seems To Be Sped

I get the feeling where everything seems to be sped up even though I am able to distinguish that I am moving at a normal rate. Small movements become much more noticeable and everything else appears to be moving at a much faster rate. It lasts anywhere from 5-10 minutes long ranging in the severity of the sped up motion . This feeling usually occurs when sitting in bed reading or on the computer. It only happens a few time a year. I can recall it happening twice this year so far. thank you