Comparative evidence

h₁ger

• OInd. gr̥-/jāgr̥- 'wake' (Whitney 1885: 39); 'be awake', 'be watchful'; 'awake'; 'watch over', 'be attentive' (to), 'be intent' (on), 'care' (for), 'provide', 'superintend'; (said of fire) 'go on burning'; 'be evident'; 'look' (on) (MW: 417)

• OInd. jṛ- 'awake'; 'move', 'approach' (MD: 102)

References

MW = Monier-Williams, M. 1899. A Sanskrit-English Dictionary. Clarendon Press.
Whitney 1885 = Whitney W. D. 1885. The roots, verb forms and primary derivatives of the Sanskrit language. A supplement to his Sanskrit grammar. Leipzig.
MD = Macdonnell A. 1893. A Sanskrit-English Dictionary. London: Longmans, Green and Co.