watchful in WordNet English dictionary

1. engaged in or accustomed to close observation
   "caught by a couple of alert cops"; "alert enough to spot the opportunity when it came"; "constantly alert and vigilant, like a sentinel on duty"
   alert  watchful 
   
2. experiencing or accompanied by sleeplessness
   "insomniac old people"; "insomniac nights"; "lay sleepless all night"; "twenty watchful, weary, tedious nights"- Shakespeare
   insomniac  sleepless  watchful