Sorry, but it is impossible to answer your question as there were many, 100's of thousands of soldiers involved in WW1 who worked many types of jobs in many differing locations in many different conditions. All of whom were able to sleep many differing hours.
4
4
How many hours does it sleep
3 or 4 hours
if you mean how many hours you should sleep in a year it would be 3,650 hours of sleep for a regular year not a leap year
I sleep about 7 to 9 hours a day
you must get atleast 9 hours of sleep
about 10 hours of sleep
Its compulsary for a teen ager to sleep 8 hours..
Sloths sleep for about 15-20 hours a day, making them one of the most sleepiest animals in the world. They are mainly active during the night.
6 Hours of sleep is enough
You should sleep six hours in the morning.