Many nights, especially after being stressed or anxious, i tend to start to fall asleep and jerk back wide awake and can't fall back asleep. does anxiety and stress causenthis, and is there anything that can prevent it from happening?

Anxiety and stress will cause loss of sleep. Don't get hooked on sleeping pills, have some tea before bed. You must learn to reduce the stress or deal with it as best you can. If need to see a therapist for your problem.

Hypnic jerks are relatively common and physical and mental stress are among others involved. Allowing for relaxing activities before falling asleep may help.

Agree with Drs. P and T. Sleep hygiene: Visit this site for info on this topic https://www.cdc.gov/sleep/about_sleep/sleep_hygiene.html Wish you good health!