# Do Astronauts snore when sleeping in Zero G?

"Microgravity was associated with a 55% reduction in the apnea–hypopnea index (AHI), which decreased from a preflight value of 8.3 $\pm$ 1.6 to 3.4 $\pm$ 0.8 events/h inflight. This reduction in AHI was accompanied by a virtual elimination of snoring, which fell from 16.5% $\pm$ 3.0 of total sleep time preflight to 0.7% $\pm$ 0.5 inflight"