Some people have difficulty getting to sleep while their body is still wound up from working out. Others have no problems. Perhaps try it and see how you go. 4-5 hours is probably enough to wind down, 2-3 hours may be more of an issue.
If you do find you have some difficulty sleeping after a later workout, there are still options:
* plan a shorter, faster run that day (or use the incline) - higher intensity workouts offere additional health and fitness advantages anyway.
* take the opportunity to cross train with a different machine (eg. bike, elliptical) rather than waiting for a treadmill to become available.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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