According to your progile you're on Gliclazide. Is that still correct?
If so, it might be a bit on the low side if this is lower than usual for you.
If you're not on glucose lowering medication like gliclazide or insulin this is a perfect level.
Please contact your HCP on what is the right course for you, as we're all different.
If you're not sure you won't go too low tonight at 4.9, why not consider something small to eat before bed?
Have you tested again to see if it has gone up or down?
You really have to decide for yourself. We're all different, and food which may make me go up just a little may make you go very high, or the other way around.
This would be a very good question to ask your HCP when you can contact them again.
Have you re-tested to see in what direction you're going?