c++ sleep_ oddness

Start time: 9398393752789
End   time: 9398393756203
Sleep till: 9398394752789
It took: 3414 nanoseconds.
It took: 0.003414000 milliseconds.
Start time: 9398396278178
End   time: 9398396279031
Sleep till: 9398397278178
It took: 853 nanoseconds.
It took: 0.000853000 milliseconds.
Start time: 9398398411041
End   time: 9398398411894
Sleep till: 9398399411041
It took: 853 nanoseconds.
It took: 0.000853000 milliseconds.
Start time: 9398400037461
End   time: 9398400038741
Sleep till: 9398401037461
It took: 1280 nanoseconds.
It took: 0.001280000 milliseconds.
Start time: 9398401807664
End   time: 9398401808944
Sleep till: 9398402807664
It took: 1280 nanoseconds.
It took: 0.001280000 milliseconds.
Start time: 9398403682826
End   time: 9398403684106
Sleep till: 9398404682826
It took: 1280 nanoseconds.
It took: 0.001280000 milliseconds.
Start time: 9398408526673
End   time: 9398408527953
Sleep till: 9398409526673
It took: 1280 nanoseconds.
It took: 0.001280000 milliseconds.
Start time: 9398412937036
End   time: 9398412938316
Sleep till: 9398413937036
It took: 1280 nanoseconds.
It took: 0.001280000 milliseconds.
Start time: 9398417583768
End   time: 9398417585475
Sleep till: 9398418583768
It took: 1707 nanoseconds.
It took: 0.001707000 milliseconds.
Start time: 9398421991144
End   time: 9398421992424
Sleep till: 9398422991144
It took: 1280 nanoseconds.
It took: 0.001280000 milliseconds.


Start time: 9398428814685
End   time: 9398429313874
It took: 499189 nanoseconds.
It took: 0.499188989 milliseconds.
Start time: 9398432838069
End   time: 9398433325312
It took: 487243 nanoseconds.
It took: 0.487242997 milliseconds.
Start time: 9398437079049
End   time: 9398437315844
It took: 236795 nanoseconds.
It took: 0.236794993 milliseconds.
Start time: 9398441044834
End   time: 9398441325575
It took: 280741 nanoseconds.
It took: 0.280741006 milliseconds.
Start time: 9398445031952
End   time: 9398445321653
It took: 289701 nanoseconds.
It took: 0.289701015 milliseconds.
Start time: 9398449057470
End   time: 9398449322425
It took: 264955 nanoseconds.
It took: 0.264955014 milliseconds.
Start time: 9398453083841
End   time: 9398453318929
It took: 235088 nanoseconds.
It took: 0.235088006 milliseconds.
Start time: 9398457101252
End   time: 9398457326101
It took: 224849 nanoseconds.
It took: 0.224849001 milliseconds.
Start time: 9398460983839
End   time: 9398461320045
It took: 336206 nanoseconds.
It took: 0.336205989 milliseconds.
Start time: 9398465578092
End   time: 9398466331996
It took: 753904 nanoseconds.
It took: 0.753903985 milliseconds.

Process returned 0 (0x0)   execution time : 0.110 s
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