The vestibular system suffers badly from acceleration in any direction, not just straight line acceleration.
Fluid movement in the canals will lead to the "leans" and other illusionary effects.
A night takeoff into an instrument climb is not the right time to find out you have sensory illusion difficulties.
The transition onto instruments difficult enough without added complication coming from a rushed reconfiguration , a quite sudden change from pitch down in the final phase through flare to runway, re config, now power on and back into theclimb and after T/O checks.
At night all actions should be nice and slow, double check, and if in doubt don't go.