How do I know if I can get rid of a file I don't recognize?

My macbook got quiet full & I just installed "Disk Inventory X" which shows me where is my memory going to. I discovered many memory consuming files which I can't recognize like: sleepimage which takes 2 GB & is located in private/var/vm/textedit
How can I know if I am allowed to get rid of that file, If it's necessary for my computer etc? I have many more enormous files like this one & afraid to throw them... Thanks for any advise

When you put your computer to sleep the contents of your RAM are written to the sleepimage file. This way, if there is a power failure or your machine shuts down unexpectedly in some other way, the data you had in RAM when you put the machine to sleep won't be lost.
You can disable this process through Terminal (see this topic), but simply deleting the file won't save the hard drive space because the file will be recreated the next time you log in or restart.

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