Keep your eyes moisturized at night with Systane NightTime Lubricant Eye Ointment. If you suffer from overly dry, irritated eyes that make it hard to fall asleep and stay asleep, there is relief in sight.. This preservative-free ointment provides relief and protection by keeping your eyes lubricated throughout the night, allowing you to rest easy. Dry eye therapy, For nighttime protection of dry eyes, Safe and effective formulation with no preservatives.