There are multiple definitions:

1. Associated Professional Sleep Societies(English)

   • AASM, SRS
   • Sleep medicine, Organizations (documentation)
   • https://aasm.or…ent/sleep-2020/

2. Attenuated Positive Symptoms Syndrome(English)

   • APA, APS, BLIPS, CAARMS, DSM, GRD, PRS, SIPS
   • Psychosis, Psychiatry
   • https://doi.org…syt.2020.568982