See: How to permanently delete your Facebook account
To temporarily deactivate your Facebook so that you can re-activate it whenever you feel like, follow the tips underlined below:

How to Deactivate Your Facebook Account Step by Step
To deactivate your Facebook profile account, follow the steps below:
- Click the account menu
at the top right of any Facebook page
- Select Settings
- Click General in the left column
- Choose Manage your account then follow the steps to confirm