Hypnic jerk. matath smahara kaaleta dawas 2-3 eka digata awilla thiyenawa nidaganna hadaddi.
https://en.wikipedia.org/wiki/Hypnic_jerk
https://en.wikipedia.org/wiki/Hypnic_jerk
"According to the American Academy of Sleep Medicine there is a wide range of potential causes, including anxiety, stimulants like caffeine and nicotine, stress, and strenuous activities in the evening. It also may be facilitated by fatigue or sleep deprivation.[7] However, most hypnic jerks occur essentially at random in healthy people."