You will not be able to sleep if you are anxious and you keep looking at the clock.

Your body can compensate with a loss of one night's sleep.   In my IT career I did a lot of emergency 24+ hour jobs.

Here is what you can do:  One hour before the interview, drink a cup of coffee, maybe 90 mins if you put sugar in the coffee.   Although you may be tempted to give yourself a boost right before the interview, but the sugar will make you jittery and nervous.

Trust me - once the interview starts, the slight bit of nervous adrenaline will follow you through.   Good luck!