Snoring
Snoring was a noise made during sleep due to obstructed air movement while breathing. In humanoid species, the condition was known to be found in Humans, Cardassians, Vulcans, and Cos' species.

Cadet Sylvia Tilly snored, sometimes disturbing Michael Burnham, her roommate. () Burnham later recalled this, noting that she had set the computer to block the frequency so she could get sleep. She only, however, blocked it out for a few days, then started liking it. ()

In 2368, when a memory-less Ensign Ro Laren suggested she and William T. Riker stay in his quarters and "see what happens", Riker asked "What if I snore in my sleep?" ()

In 2369, Deanna Troi elbowed a snoring Riker after the commander fell asleep listening to Data recite Ode to Spot. () 

In 2370, Quark assured  that he didn't snore. ()

Also that year, Martus Mazur was bothered by his cellmate Cos's loud snoring when he was imprisoned in a Deep Space 9 holding cell with him. ()

In 2372, Lieutenant commander Jadzia Dax claimed that she could hear Kor snoring through the bulkheads of the  when she was on a mission with him and Lieutenant commander Worf to find the fabled Sword of Kahless. ()

In 2374, The Doctor was concerned that some crewmembers of the  might snore while he was listening to Puccini, as they had to sleep there temporarily as an energy-saving measure. Chakotay suggested that they shut his program down instead. ()

One day in 2374, Weyoun went to wake Damar when he didn't respond to the comm system and found him snoring. ()

In 2376, Captain Kathryn Janeway found herself developing romantic feelings for the holographic character Michael Sullivan from the holographic program Paris 042, "Fair Haven." During a picnic, he began snoring, and Janeway considered using the 's computer to alter his vocal algorithms, only to decide that everything around her was an illusion and leave. In describing this later to The Doctor, he suggested "perhaps next time you should just let him snore." ()

That same year, Ensign Farley snored during a lecture by The Doctor, an incident that  B'Elanna Torres later gossiped about with Ensign Tom Paris. ()

Also that same year, after going without sleep for over ten days, Lieutenant commander Tuvok fell asleep on Voyagers bridge and began snoring. ()

According to Paris, Harry Kim snored. ()

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Medical conditions
Physiology
Sleep