Tips for business travellers from Banyan Tree Spas Drink lots of fluids on flights, especially fresh fruit juices or plain water. Avoid alcohol and caffeine. Perk yourself up with the scent of eucalyptus oil if you are feeling lethargic after a flight. If you cannot sleep, have a hot shower or soak in a hot bath. Essential oils, such as lavender and ylang ylang, can help you relax and sleep when you have jet lag. Go for a body massage to restore blood circulation and relieve muscle tension.