Bull frogs never sleep it is being proven by the researchers that when given a
shock to their body they responded the way they are awake or resting. The test includes giving shock to the frog.
The main reason behind this activity is that even during the time of their resting phase they never failed to show a change their respiratory responses
After a painful stimulus (Cutaneous shock). The same report was also acknowledged by the researchers that threshold arousal could not be measured during the time of cyclic phases with the lowest amount of respiratory activity and neither could they be tested with a psychological stimulus such as sound or light. In order to test the truth behind this, the shock was delivered at the late night in the time when the sleep has just started the outcome is very much astounding and surprising as well. The respiratory organs responded the same way when they are awake.
Thus frog has the ability to stay alerted at night as well.