My SWAG is that if I tried to recall every minute of the last 24 hours, I'd have a <10% success rate, and about 30% of what I did recall would be confabulated. If I tried to recall every minute of the last 240 hours, I'd have a <1% success rate. In that context, worrying about forgetting two hours I spend sleeping isn't really my highest priority.
As everyone here knows, it would be a stupid idea to switch from airplanes to cars out of safety/terrorism concerns: Cars are a much more risky means of transportation than airplanes. But what other major risks are there that many people systematically undervalue or are not even consciously aware of?
The same can be asked for chances.