Bad dreams occur now and then for adiyen; these are usually followed by undesirable incidents. What to do to avoid this?

To avoid bad dreams, recite every night before retiring to bed the 39th sloka of Mukundamala of Kulasekara Azhwar.
kSIrasAgara tarangashIkarA
sAratArakita cArumUrtayE !
bhOgibhOga shayanIyashAyinE
mAdhavAya madhuvidviSE namaH ||
Similarly, one must chant thrice the divine name ‘Madhava’ – before lying down for sleep, chant ‘mAdhavA, mAdhavA, mAdhavA’ three times, which will ensure that no bad dreams ensue.