You can add a few drops of Lavender oil to your pillows, bed or soles of your feet before going to bed. One of the benefits of lavender oil is applying it by dropping it into a carrier oil to soothe skin irritations. You can freshen your clothes, bed, car or the air of your environment by mixing lavender essential oil with water in a spray bottle. The answer to the question of what lavender oil is used for is that it can be used for a soothing effect on fly bites or as a fly repellent. You can add it to your drinks to relieve your stressful and anxious state.