Mixing glycerin, rose water, aloe vera gel, and honey is generally safe and highly moisturizing. However, you should avoid leaving lemon juice on your skin overnight. Lemon juice is highly acidic and can cause skin irritation, dryness, or increased sensitivity to sunlight. For a safe overnight treatment, I recommend preparing the mixture without the lemon juice. Additionally, always perform a patch test on a small area of your skin, like your inner arm, for 24 hours before applying any new mixture to your face to rule out any allergic reactions or sensitivity.