Can't say, but I didn't have a problem booking sleeper tickets at a couple of days notice in 2015. Would also agree with armchairtraveller. Did overnight bus sleeper which was very comfortable too. Even for more mature travellers, we were mid 40s and mid 50sHi, does anyone know if this is possible to do outside of Vietnam? On 12goAsia and baolau it only gives me the VIP options, I just want tickets for a normal soft birth sleeper…..