「？
Is it harder to snore if you sleep on your side?
Literal
Side-facing [into-に] sleep [when-と] 'snore' [object-を] do-hard?
A casual health-tip question. 横向きに寝る ('sleep sideways,' 'sleep on one's side') uses 横向き ('sideways,' 'side-facing') as a な-adjective/noun + に (direction/manner particle) + 寝る ('sleep'). ~にくい ('hard to X,' 'difficult to X') attached to a verb stem creates an adjective: かきにくい = 'hard to make (the sound).' いびきをかく is the fixed collocation 'to snore' — 掻く ('scratch, make the sound') is an unusual verb to pair with 'snore' in English intuition, but Japanese uses 掻く for the act of making the snoring noise.