The husband has been overly tired lately.
Oh, it could be the weather,
or the fact that he's getting back into the swing of things after being out the office for three weeks,
or the fact that he's the father of two young children and he's got a spouse who's going through some career/mid-life crises the magnitude of which threaten to get even bigger,
or maybe he's not getting enough sleep.
"I wonder if I'm having sleep issues because of sleep apnea. Do I snore?"
If you're said husband's mid-life-crisising conflicted spouse, you should know better than to say,
"Well, you don't really, at least not in a long while."
Because should you reply in that manner, be prepared to be serenaded by the rumblings of successive oncoming trains at 4:00 AM.