The singer said the disruption his baby son Theodore is causing at night has come as a shock to the system, particularly because his and wife Emily's three-year-old daughter Amelia was always such a good sleeper.
But they are doing their best to maximise their chances of getting some sleep, reported Contactmusic.
"Little Theo has had me up early every morning. I know he's only 10 weeks old and a lot of people will probably say it's not unusual, but because Mills was sleeping through the night from six weeks I'm finding it particularly hard.
The 43-year-old singer also has kids Junior, 11, and Princess, nine, with ex-wife Katie Price.