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. (DIS: "Choose Your Pain") 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. (DIS: "All Is Possible")
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?" (TNG: "Conundrum")
In 2369, Deanna Troi elbowed a snoring Riker after the commander fell asleep listening to Data recite Ode to Spot. (TNG: "Schisms")
In 2370, Quark assured Pel that he didn't snore. (DS9: "Rules of Acquisition")
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. (DS9: "Rivals")
In 2372, Lieutenant commander Jadzia Dax claimed that she could hear Kor snoring through the bulkheads of the USS Rio Grande when she was on a mission with him and Lieutenant commander Worf to find the fabled Sword of Kahless. (DS9: "The Sword of Kahless")
In 2374, The Doctor was concerned that some crewmembers of the USS Voyager 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. (VOY: "Demon")
One day in 2374, Weyoun went to wake Damar when he didn't respond to the comm system and found him snoring. (DS9: "'Til Death Do Us Part")
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 USS Voyager'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." (VOY: "Fair Haven")
That same year, Ensign Farley snored during a lecture by The Doctor, an incident that Lieutenant B'Elanna Torres later gossiped about with Ensign Tom Paris. (VOY: "Memorial")
Also that same year, after going without sleep for over ten days, Lieutenant commander Tuvok fell asleep on Voyager's bridge and began snoring. (VOY: "Muse")
According to Paris, Harry Kim snored. (VOY: "Lineage")
In 2401, Worf snored while napping on the bridge of the USS Enterprise due to exhaustion, following the events of Frontier Day and the destruction of the Borg Queen's cube. (PIC: "The Last Generation")