Chess and sleep correlation

Im trying to gather information on just how severe of an effect lack of sleep has on chess any personal experience or opinions anyone wants to share for my research?

Lack of sleep doesn't have any desirable effects on cognition.

I believe lack of sleep has a severe effect on basically everything you do.
 

As GnrfFrtzl said, lack of sleep has a negative effect on basically anything you do although I would say mental activities moreso than physical. Personally lack of sleep for me has resulted in basically lack of concentration during a long over the board game, like I would just spend longer on moves because it would take me longer to judge the position correctly, more or less calculation is not that much affected because you have a definite thing to do but judging the position objectively can be difficult when it gets complicated in the game. Moreover I would tend to just lose concentration and drift off, once I used 40 minutes on my clock. But then again even though I'm young I'm still pretty overweight and unhealthy so I would think lack of sleep is less severe for thinner and healthier people. To clarify I play at a competitive level of roughly 1800-2200 FIDE, Hope this helps :)