indeed with just a few twenty minute meditations on the Four Elements i found this form of practice to be very soothing and relaxing and quite benificial in aiding sleep, as sometimes Anapanasati can have too much of an invigorating effect on me before bedtime
Aflame with the fire of passion, the fire of aversion, the fire of delusion.
Aflame, with birth, aging & death, with sorrows, lamentations, pains, distresses, & despairs ......
Seeing thus, the disciple of the Noble One grows disenchanted. SN 35.28