Chandigarh to Manali roads open 24 hours and above 30 percent tourists go Chandigarh to Manali in night. All luxury buses run from Delhi or Chandigarh to Manali in night. My above 20 percent Tempo Traveller booking for night travels Chandigarh to Manali because of some trains and flights come in Chandigarh evening. You can travel in night for Chandigarh to Manali without any issues.