If you can only paint at night you'll need to carefully consider your lighting situation. Normal domestic electric lighting is called incandescent light . Unfortunately this form of lighting casts a yellowish glow and will distort colours. Another common lighting source is fluorescent light but these bulbs can alter your colours quite dramatically. There are several work-arounds here.
Halogen is considered very good at simulating natural light.
This will prevent a lot of the colour distortion you get when working under a normal electrical bulb. The best artificial lighting for simulating daylight is full spectrum light . This is available in both incandescent and fluorescent bulbs.