If you ever find yourself hankering for roti john at 4am, don’t fret as you can easily satisfy the craving at Srisun Express, which opens 24 hours. Srisun Express started out in Hougang in 2012 and has since expanded to five locations. There are five roti john (from $4.50) flavours to pick from: Plain with egg only, mutton, chicken, sardine, and Impossible meat.