Turn off Macbook automatic hibernation mode?
From a Terminal, use the following command to disable hibernation:

sudo pmset -a hibernatemode 0


If you later want to enable hibernation, use:

sudo pmset -a hibernatemode 3


If you want to free up the disk space used by hibernation, use the following command:

sudo rm /var/vm/sleepimage



Note: This file is automatically recreated as needed if hibernation is reenabled and it doesn't already exist.