New research explains why guys sleep through the sound of their babies' screams.
It's 2:00 a.m. Your baby's crying. And your husband's sleeping like a log. Sound frustrating and familiar? Hey, don't unleash your fury: Turns out, sleeping men really can't hear the cry of a baby.
According to a new study conducted by marketing-research company Mindlab International, men are deaf to a baby's cries while they're sleeping -- but a screaming infant will jolt a woman right out of dreamland. (Men, meanwhile, are more likely to be jerked awake by blaring car alarms, buzzing flies or the sound of wind rattling their windows.) The researchers also found that while women need much more time to fall back asleep after being awakened, men tend to be out cold once they hit the sheets.
Chalk it up to a woman's innate maternal instinct, which the researchers say kicks in at the first sound of a baby in distress. It all goes back to evolution: Back in the day, men had to be ready to fight saber-toothed tigers at the drop of a hat -- so their autonomic nervous systems (which control breathing and heart rate) still respond more quickly to sounds of potential danger than to the sound of a baby crying.
So the next time your baby is screaming in the dead of night, cut your (snoring) guy some slack -- then put him on diaper duty in the morning.