spending of time just make a rule to complete a task in the available 24 hours and it does not matter what time you do it but it matter you must do that within this timing range.
some of us stuck that we will get up at 4/5 am then we do this but as i already told you to be flexible in life means you can not follow it just do it when you want to do.
make the things simpler not harder.
but it far better if you get up early at dawn and do the same thing because of many factors like there is no disturbance at the time so 