Perhaps your partner mentioned that you may have a disorder called "sleep apnia"? You may assume that you sleep perfectly every night, but who are you to know... You're sleeping, right?
By the way, the correct spelling is sleep apnea or sleep apnoea.
My dictionary calls it a "transient cessation of breathing". So what is it? Sleep apnea is basically a disorder that occurs when your body forgets to breathe. It could be due to physical obstruction or simply laziness on your subconscious' part...
Because you are sleeping when it occurs, you would rarely know that you are affected by this disorder as it happens. However, a bed partner may well be aware of it before you.
There are two types of sleep apnea:
Studies show that obese people have a greater chance of suffering from obstructive sleep apnea due to the additional skin, weight of tissues, etc.
Taking depressants (some clinical drugs, alcohol, etc.) affect your neurological controls and can increase your odds of having central sleep apnea.
Most differentiate between a regular pause between breathing and sleep apnea by the time elapsed. For an adult, a pause lasting more than 10 seconds between two breaths is considered sleep apnea.
I hope that this information on sleep apnea was useful. Learn how to improve your sleep here.