That is another bad habit also....many players are so entrenched into the sheet & use it as a crutch much too much...memorization is a good technique to master. It frees up the mind to be more creative while playing. Good post Jonny !

It might sound silly but as an excercise I suggest..and I have mentioned this in previous posts on SZ for years...

1- blindfold yourself and try to play some familiar songs concentrate on less mistakes

2- have someone Talk to you while your playing this will stenghten your ability to multitask & let the playing become secondary & effortless

3- with repeated playing try to completley memorize at least one song a week. Everytime you forget any parts just adlib adding your own twist to it.