Reply To: Will I suffocate if I sleep by covering my head (and whole body) with blanket?

In addition to infants, this is bad for anyone in a microgravity environment too. At ISS, astronauts usually sleep next to ventilation fans to avoid oxygen starvation. As mentioned here, sleeping in a poorly ventilated space will result in sleeping under the CO₂ bubble. Eventually, when they start to gasp for air, they had to wake up.