Smartphones mean that many employees now carry their workplace in their pocket, and managers can send messages at any time of day. Although this constant connectivity has some advantages, I believe the disadvantages are more significant.
There are situations in which being reachable outside office hours is genuinely useful. If an urgent problem arises, such as a system failure or a sudden change to a client's order, a quick message can prevent a costly delay. For some employees, the ability to reply to emails in the evening also creates flexibility; a parent might leave work early to collect a child from school and then complete a few tasks later at home. In international companies, contact outside normal hours may be unavoidable because colleagues work in different time zones.
However, the costs of constant availability are considerable. When employees feel obliged to check messages late at night or during holidays, they never fully switch off, and over time this can lead to stress, poor sleep and exhaustion. Family life may also suffer, as a parent who is constantly glancing at a phone is not fully present with their children. Moreover, the expectation of instant replies can reduce productivity during the working day, because people who are always tired are less able to concentrate and think creatively. Those who choose not to respond may even worry that they will be seen as less committed than their colleagues.
For these reasons, organisations should set clear boundaries. Managers could agree that messages sent after a certain hour do not require a reply until the next working day, with genuine emergencies handled by a designated person on call.
In conclusion, contact outside working hours can be helpful in emergencies and for flexible working, but in most cases it damages wellbeing and productivity, so its disadvantages outweigh its advantages.