Short running training prior to half marathon race

Went for a short 3km run at targeted marathon race speed of around 10km/hr. Followed by a 1km cool down run.
Will likely be running again tomorrow for a short 3 to 4km and stop running until this Sunday 7-Dec actual race day.
Though running a short distance of 4km, felt a bit tired today. Probably due to last night did not sleep well.