In Switzerland, the Labour Law (LTr) regulates quite precisely what corresponds to those who work at night or on Sundays, but in practice those rights are not always correctly applied. Work between 11pm and 6am is in principle prohibited unless authorised, but where it exists, the compensation rules are clear. If you work at night on an occasional basis, less than 25 nights a year, you are entitled to a 25% wage supplement for each hour worked during that time. If, on the other hand, you work at night on a regular basis, 25 or more nights per year, the compensation is not money but time: an additional 10% of free hours over the night hours worked, which the employer cannot replace with an economic payment even if he proposes it.
For Sunday work the logic is similar. Working on Sundays on an occasional basis, up to six Sundays a year, entitles you to a 50% salary supplement plus equivalent time compensation. If work on Sundays is regular, there is no economic bonus: only compensation in free time. The hospitality, catering, health, bakery, or press sector does not need special authorization to work those hours, but the obligation to compensate under the applicable collective bargaining agreement (CCT) still exists.
There are people who have been doing night shifts or working on Sundays for years without ever having received these supplements, sometimes because the employer does not apply them, others because the worker simply did not know that he was entitled. If you have doubts, the first step is to review the contract and the CCT of the sector. If there is no clear answer, the cantonal labour office or any trade union can guide you at no cost.