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Whether it is safe to leave a table lamp on all night depends primarily on the type of bulb used, the condition of the lamp, and the impact on your sleep.

Here is a detailed analysis regarding safety:

1. Fire Safety: The type of bulb is crucial

1) LED bulbs (generally safe): Modern LED bulbs are highly energy-efficient and generate very little heat during operation. It is generally considered safe to leave LED bulbs on all night, as they do not overheat to the point of creating a fire hazard.

2) Incandescent or halogen bulbs (unsafe): These traditional bulbs produce light by heating a filament, meaning they become very hot during use. Leaving them on all night significantly increases the risk of fire, especially if the bulb is too close to the lampshade, curtains, or bedding.

2. Impact on health and sleep

Even if the lamp itself poses no fire hazard, leaving the light on all night can negatively affect your health. Exposure to artificial light at night disrupts the body's internal clock (circadian rhythm). This type of light exposure suppresses melatonin production, thereby affecting sleep quality, and has been linked to broader long-term health issues. If you need light for a sense of security or convenience, choosing a very dim, warm-toned (amber or red) nightlight is far better than using a bright table lamp.

3. Energy consumption and bulb lifespan

Although LED bulbs consume very little power, leaving a light on around the clock (24 hours a day) still unnecessarily increases electricity costs and gradually shortens the bulb's overall lifespan.

Safety Checklist: If you must keep the light on

If you or a family member need to keep a light on at night, follow these safety guidelines to minimize risk:

1) Use LED bulbs: Ensure you use low-heat LED bulbs rather than incandescent or halogen ones.

2) Check wattage: Never use a bulb with a wattage that exceeds the maximum rating marked on the lamp. 

3) Clear the surrounding area: Ensure the lamp is kept away from flammable items such as paper, curtains, blankets, or upholstered furniture.

4) Check the lamp's condition: Ensure the power cord is not frayed, the socket is not loose, and the lampshade is not cracked.

5) Use a timer or smart plug: The safest approach is to connect the lamp to a smart plug or mechanical timer so that it automatically turns off 30 to 60 minutes after you fall asleep.

Final Conclusion:

If you are using a well-maintained modern LED table lamp placed away from flammable materials, leaving it on all night poses no physical safety risk. However, to ensure good sleep quality and conserve energy, it is strongly recommended that you turn it off or switch to a dedicated low-brightness nightlight.