The rules for the haste spell state the following:
When the spell ends, the target can’t move or take actions until after its next turn, as a wave of lethargy sweeps over it.
--- Player's Handbook p. 250
Does this give attackers an advantage against you as you cannot move? What about making Strength/Dexterity saves during this period? I find it unclear as to what it means by 'can’t move or take actions'?