Comparative evidence

dreh₁

• Ved. drā- /drai- ‘sleep’, ‘fall asleep’, ‘slumber’ (MW: 501f., 548)

• Ved. (RV+) nidrā́- ‘sleep’, ‘slumber’, ‘sleepiness’, ‘sloth’ (MW: 548)

RV 8.48.14
a. trā́tāro devā ádhi vocatā no
b. mā́ no nidrā́ īšata mótá jálpiḥ
c. vayáṃ sómasya višváha priyā́saḥ
d. suvī́rāso vidátham ā́ vadema

“Give us your blessing, O ye Gods' preservers. Never may sleep or idle talk control us. But evermore may we, as friends of Soma, speak to the synod with brave sons around us”. (Griffith)

References

MW = Monier-Williams, M. 1899. A Sanskrit-English Dictionary. Clarendon Press.