Even with a great save vs spells you will still fail your save sometimes. Don't start whining if you do. Just accept that your chances were improved relative to what they would have been otherwise.

The best way to deal with sleep tends to be to prepare before you get slept and then have a plan of escape for after you get slept. If you avoid situations where this plan cannot work (eg locked room when you can't walk through doors) you should be fine more often than not.