Falling asleep is not a positive thing a game should cause it's players. That's not an environmental hazard, it's a red flag for anyone who cares to make a good game.
It's certainly not an example of how running into a star that they place you directly in front of and facing is a measure of player skill to avoid.
Not falling asleep at all ! It is the same problem with driving... On long car rides, your attention may shift at some point and It can be dangerous.
Well obviously not as dangerous with ED, of course...
Attention is your worst enemy in exploration (landing on higrav planets, white dwarf,going back to the bubble with being ganked,repair your ships regularly,...)
I would love to have more environmental hazards for sure, but still, easy for smaller rides outside de bubble, not so much for longer exploration journeys.
In fact, loving both exploration and combat, I find combat a lot easier in an over-engineered FDL/Corvette
