एवमपि like that, शासस्य because of curse, वशम् under the spell of, आपन्नः wrap, अन्तिद्रिः, यदा like that, नैवप्रबुध्यते not wakened, ततः then, निशाचराः Rakshasas, क्रुद्धाः enraged.

Wrapped in sleep like that because of the spell of the curse, he had not wakened. The Rakshasas got enraged.