i take 10mg hydrocodone with 15mg of zopiclone. i take sleeping pills every night but i will take the two together when i need my percocet. i'm not sure what your sleeping aid is exactly (i'm in canada), but my sleeping pill is considered a hypnotic.
i always add new drugs very slowly though, like i started with half a zopiclone the first night, and worked my way up to my regular dose (15mg). i never take more than i'm prescribed, because i realize how dangerous it is to start mixing and even though i can take two or three times the amount of both drugs by themselves, i would never mix them at the higher amounts, only the subscribed amount (your tolerance to a drug may vary, i do take my percocets or zopiclones recreationally sometimes, but keep the dose down for low tolerance..).
it's a scary feeling when you've crossed the line and start thinking you might have taken too much... i have bad anxiety and will take a clonazepam for an attack, one time i thought i was having breathing issues (turned out to just be my anxiety), but i refused to add my benzo to get rid of it because that might have really hurt me! was a catch 22.
when in doubt i call and ask a pharmacist about drug interactions and even check the net for info too.
stay safe!